Automatic switch



Dec. 15, 1942. i-l. E; YOUNG Erm. 2,304,986

AUTOMATIC sw'l'rca Filed April 21, i939 223.1 ro APMM/ev sajv 15 AF?.

a .9 if .J5

192/ /Z 7l/7 232/ f "as f CONSTA/vr Z6) ma W 27)' L... Hy-4 f HUGH E. YOUNG' HND EUG NE H. HHl/G Patented Dec. 15, 1942 AUTOMATIC SWITCH l'lugh E. Yong and hicago,

Eugene H. Haul.

Ill.

Application April 21, 1939, Serial No. 269,142

Claims.

Qur invention relates to constant current load, alternating current power distributing systems, and more especially to protection against destructive high voltages resulting from open circuit conditions. It relates still further to an automatic electrically operated primary breaker switch and control means therefor.

It is one of the objects of our inventionto provide an improved switching device such as may be utilized in the present circuit and in the circuit arrangement shown in Patent No. 2,226,041 issued December 24, 1940, so as to obtain complete open circuit protection for constant current systems, such as illustrated thereby and so that when an open circuit occurs in the constant current load line, high voltage switching apparatus will in sequential order short circuit the ltransformer secondary of the constant current regulator and then immediately disconnect the primary supply circuit from such regulator.

It is another object of our invention to provide kan improved electrical switching apparatus utilining automatic cut-ins of such nature as pyroelectric cut-outs or the like in combination with a method for providing a means for constant current control whereby the primary switch will open due to a fault in the constant current load circuit. The switch of our invention is so designed that it is impossible to reset the said switching apparatus without ilrst having repaired or corrected the load line fault causing the open circuit.

It is a further object of our invention to provide an. improved switching apparatus so constructed that the switch must be reset manually after an open circuit trip-out. Thus, not only must the fault causing the open circuit condition be first corrected but switching apparatus must then be f reset or closed manually after the correction of wires under these conditions. The construction of the switching mechanism requires, first, that the constant current circuit be in perfect operation and condition before the switch may be reclosed or reset, and secondl that the switch must then be resetmanually before the load line of the constant current system can be re-energized. There is no possibility of reclosing or resetting the switch until al1 faults causing the open circuit condition have been cured.

This invention is illustrated by the accompanying drawing in which:

Figure l is mainly a circuit diagram of a constant potential source to constant current load system.

Fig. 2 shows a side view of the automatic switch contained in the circuit of Figure 1.

Fig. 3 is an enlarged side view of the switch latch.

Fig. 4 shows the construction of the breakdown cut-in device contained in the circuit of Fig. 1.

Referring iirst to Figure 1, the constant current load circuit I is supplied with power through a constant current regulator 2' which receives constant potential current through leads I connected to the constant potential power source leads 4 through an automatic control switch I.

Said switch 5 comprises a pair of appropriately mounted terminals 6 to which the leads 4 are connected respectively, a pair oi' hinge terminals I to which leads I are connected, a pair 'of blades or bars l pivoted to terminals 1 for make and break contact with terminals 6, an insulation cross bar 9 connecting said blades and having a handle III for closing-the switch, a tension spring II connected to pull the switch open, a latch I2 to lock 'the switch closed, a solenoid I3 and plunger II to release said latch. 'I'he insulation block I5 on which said terminals 8 and 'I and solenoid Il are mounted also carries an anchorage I8 for the inner end of spring II and a pivot mounting I1 for the outstanding latch I2.

The switch blade members I have leverage arms 8' extending back of their hinge pivots Il whereon are mounted two insulation crossbars I8 and 20, the former medially and the latter at the outer ends of arms 8'.

The movable .end of spring II is attached to the middle of bar I8 for pulling the switch open when released, and the free end of latch I2 engages the middle of bar 20 so as to prevent opening when the switch is closed, the latch being notched at 2| to enable engagement when the latch swings downward as by gravity on closing the switch, as viewed in the drawing, and to enable release when pushed upward by plunger Il through its extension finger 22 so as to release the switch for opening by spring II. Latch I2 has a stop toe 2l to limit downward swing when the switch is open.

Solenoid I3 is energized by overpotential on by comme@ s nomally apen, but desee voltages on the im@ E. is Le or simile? 15o the device o sul l Ie ci-esre to delay the opening e, m esponse ou solenoid M, the 1 of he plunger finger 22 is 1ndifferent point @n said e eeeelm ef E, pemomten: solenoid; ohm Gmet lower Asieg phmve: M m6; so

ef plungng means es composite 'mit comprises a pair of de'mna die? E? two memedate f? 5"" .m of e-negau ted or mecuried coppe? im combination with :L 0i' inmmeziate imetng rings of mies, and a cmmpng suppoyt eomprsilg 33g man Wheh the elements QQ, mld JM are securely damped 31 kalte and 'plete Mi has a eide terapetu. Y. 1525 xeeeve s, eonduetor fastening therei'or, Het ehem, as will be apon ou of the circuit diagram, Fig.

thin Eefje? @I mercury on the Copper is illustrated at 3. Holes 50 in the diseelcel myers o3 ennuh 44 serve each im en 10XL- en ehamsel' There, in use, dangerously high normal pessues ceuse ionms'on of the meru shocrcutng as." lf W ife- J A32: winzige reaches azoui; .TLS mlm across; 2021: ercuit it; remains constant so long as the load remadns *she same, then in Case of an accident ae the leed circula whereby it is opened as by dezhm'cl o e, bmp or the breaking of s. load he deluge jumps upward immedi- U d "haty, but is m'ested at about mention of the circuit closing voltage 'then drops mmecatey ve volts where it remains, due istie of *me tremformer (not constan current regulator i.

mez i5 im me ch ifi twine upward@ sume- 'Mock H and when leekwehe he notch El; of said geinst shoulie and wi; pvot egains me drops rownv l. melee ef aanstaat man?. mln-e1 -f )gameti betwe M mi lf3 L u naive, Mi.. wm, the A mid wiwi 11.@ eti cammini; Lew e, censbant eurrenb between am! we; ematepening soeref @ries with ed a ne.

with he Vies 3. The cambia tiene a e@ ,iee of electric emrezw, Gew line, regulating meen@ with an operating miem-nifl,

s-ei;

u" e". A eonstant voltage source to constan#J cur i at had safety control system comprising a sole- W. and. plunger actuated utomatic 'neafev' n in me primary ecuit, and en o closer conneced series W5 @imm 

